Since dropping Microsoft Points as a currency, the Xbox Rewards program now racks up "Credits" that are converted into currency after reaching certain tiers like 5000. The FAQ says:
What happened to Microsoft Points?
A. Microsoft Points are officially retiring. Instead, you can use money to purchase content on Xbox (see Xbox.com Points FAQ) for more information). With this change, it became necessary for us to evolve the way we reward you. Instead of Microsoft Points, Xbox Live Rewards members can now earn Rewards Credits, which are converted into your local currency and deposited as cash directly into your Microsoft account.
I don't see a posted Credits conversion rate. Is it a fixed or variable rate? How does it differ between currencies? How can I predict the cash payout from my Credits?